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  <title>Sets rotation factor</title>
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 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.ps-rotate" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">ps_rotate</h1>
  <p class="verinfo">(PECL ps &gt;= 1.1.0)</p><p class="refpurpose"><span class="refname">ps_rotate</span> &mdash; <span class="dc-title">Sets rotation factor</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.ps-rotate-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>ps_rotate</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$psdoc</code></span>
   , <span class="methodparam"><span class="type">float</span> <code class="parameter">$rot</code></span>
   ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Sets the rotation of the coordinate system.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.ps-rotate-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">psdoc</code></dt>

     <dd>

      <p class="para">
       Resource identifier of the postscript file
       as returned by <span class="function"><a href="ps_new.html" class="function">ps_new()</a></span>.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">rot</code></dt>

     <dd>

      <p class="para">
       Angle of rotation in degree.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.ps-rotate-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.ps-rotate-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4230">
    <p><strong>Example #1 Rotation of the coordinate system</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">function&nbsp;</span><span style="color: #0000BB">rectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">ps_moveto</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">ps_lineto</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">ps_lineto</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">ps_lineto</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">ps_lineto</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">ps_stroke</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">$ps&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ps_new</span><span style="color: #007700">();<br />if&nbsp;(!</span><span style="color: #0000BB">ps_open_file</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"rotation.ps"</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;print&nbsp;</span><span style="color: #DD0000">"Cannot&nbsp;open&nbsp;PostScript&nbsp;file\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;exit;<br />}<br /><br /></span><span style="color: #0000BB">ps_set_info</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"Creator"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"rotation.php"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_set_info</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"Author"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"Uwe&nbsp;Steinmann"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_set_info</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"Title"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"Rotation&nbsp;example"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_set_info</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"BoundingBox"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"0&nbsp;0&nbsp;596&nbsp;842"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$psfont&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ps_findfont</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"Helvetica"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">""</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">ps_begin_page</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">596</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">842</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_set_text_pos</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">100</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_save</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_translate</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">100</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_rotate</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">45</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">rectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_restore</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_setfont</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$psfont</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">8.0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_show</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"Text&nbsp;without&nbsp;rotation"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ps_end_page</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">ps_delete</span><span style="color: #007700">(</span><span style="color: #0000BB">$ps</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>
     The above example illustrates a very common way of rotating a
     graphic (in this case just a rectangle) by simply rotating the
     coordinate system. Since the graphic&#039;s coordinate system assumes
     (0,0) to be the origin, the page coordinate system is also translated
     to place the graphics not on the edge of the page. Pay attention
     to the order of <span class="function"><a href="ps_translate.html" class="function">ps_translate()</a></span> and
     <span class="function"><strong>ps_rotate()</strong></span>.  In the above case the rectancle is
     rotated around the point (100, 100) in the untranslated coordinate
     system. Switching the two statements has a completely
     different result.
    </p></div>
    <div class="example-contents"><p>
     In order to output the following text at the original position, all
     modifications of the coordinate system are encapsulated in
     <span class="function"><a href="ps_save.html" class="function">ps_save()</a></span> and <span class="function"><a href="ps_restore.html" class="function">ps_restore()</a></span>.
    </p></div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.ps-rotate-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="ps_scale.html" class="function" rel="rdfs-seeAlso">ps_scale()</a> - Sets scaling factor</span></li>
    <li class="member"><span class="function"><a href="ps_translate.html" class="function" rel="rdfs-seeAlso">ps_translate()</a> - Sets translation</span></li>
   </ul>
  </p>
 </div>

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